<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>基础选择器</title>
  <style>
    .red {
      color: red;
    }
  </style>
</head>
<body>
  
  <ul>
    <li class="red">冰雨</li>
    <li>天外来物</li>
    <li>演员</li>
    <li>爱你</li>
  </ul>
</body>
</html>